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I am trying to create categorized symbology for a data layer. The column that I would like to base the categories on is a result of a table join. For some reason it isn't working. All of my polygons are blue (see photo). How do I fix this?

enter image description here

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    Hard to tell from the info provided, but did you save the dataset to a new vector after you joined? – BritishSteel Mar 5 '15 at 21:11
  • Rule based did the trick! I appreciate the help. – Caleb A Mar 10 '15 at 15:26
  • Glad it worked Caleb, I will post the comment as an answer for the convenience of others. – Joseph Mar 12 '15 at 12:52
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I believe this is a bug in QGIS where using the Classify option for categorised and graduated styling only outputs a single colour for joined layers (atleast for me as I use QGIS 2.6.1 and I have dozens of joined layers).

A useful workaround is to use Rule-based styling as this recognises fields from joined layers and allows you to apply more advanced filters.

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